[swift-evolution] [Review] SE-0187: Introduce Sequence.filterMap(_:)

[Tino Heth]

> Experienced programmers (as experienced as any Swift programmer can be for a 4-year-old language) frequently use flatMap when they mean map
When you look at those examples:
What would stop those programmers to use filterMap in the exact same way, instead of switching to map?
A hypothetic migrator most likely would just replace names...
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